Hoisting mechanism



J. H. DONAT.

-H0|STING MECHANISM. APPLICATION men AUG-2} m9.

1,333,064. Patented Mar.9,1920.

2 SHEETS-SHEET I- J. H. DONAT'.

HOISTING MECHANISM.

APPLICATION FILED AUG .2. l9l 9.

Patented Mar. 9, 1920.

2 SHEETS-SHEET 2 a.. 3 w F 3 w W &

UNITED STATES PATENT OFFICE. j JOSEPH H. DONA'II, or NEW/YORK, N. Y., AssreNoR '10 IGILLIS & GEOGHEGAN, on NEW YORK, N. Y., A FIRM.

HQISTING MECHANISM.

Specification of Letters Iatent.

Application filed. August 2, 1919. Serial No. 314,857.

To all wkom it may concern Be it known that I, JOSEPH H. DONAT,

a citizen of the United States, residing in- Y the load by an electric motor, and for stopping such motor during the'lowering operation, by gravity, and controlling such lowform of the invention.

ering by a brake, thus effecting an economy in current and permitting the empty cans or other load to be lowered rapidly and checked "quickly. Another important object is to provide means for automatically limiting the length of cable wound upon the hoisting-drum in the hoisting operation and thus preventing overwinding, and a further object is to provide means whereby the hoisting, lowering and braking. operations are all controlled by a single lever.

The invention consists in certain novel features and details of construction and arrangement by which the above and other objects are attained, to be hereinafter described and claimed. I

The accom anying drawings form a part of this speci cation and show an approved Figure 1 isa side elevation of a. hoisting head embodying the invention.

Fig. 2 is a corresponding plan view, with certain portions broken away to show contained parts.

Fig. 3 is a vertical transverse section through the hoisting drum and brake drum, taken on the line 33 in F 1g. 1.

Fig. 4 is a side view of a portion of the differential gear, the hoisting-shaft being shown in cross-section.

Similar letters of reference indicate the same parts in all the figures.

A is a bifurcated frame with its arms A? extended horizontally forward, shown as telescopicallyina hollow post, not shown, set in a hoistway extending from the cellar to the sidewalk.

Monn'ted on and above the frame is an lectric motor B of any approved type, controlled by any suitable switch device, not

shown, contained in the controller casing A on a controlling shaft C, mounted transversely in the arms A and free to oscillate. The drive shaft 13 of the motor extends longitudinally of the frame and is equipped with a brake-drum. B and carries at its thereon adjacent one of the arms, the winding drum F and a beveled gear-wheel F a similar gear-wheel F 3 is fixed 0n a' sleeve F 4 loosely inclosing the opposite end oft-he shaft F, and on the sleeve F is keyed a hoist-ing brake-drum F An annular Wormwheel G encircles the space between the beveled gear-wheels F F and receives the outer ends of the spider arms H see Figs. 3 and lfof a spider-frame H the hub of which "is Patented Mar. 9, 1920. V

loosely mounted on the shaft F between the wheels F F The spider arms H each carries a beveled pinion H in mesh with. both the beveled gear-wheels F F, and the'teeth of the Worm-wheel G mesh with the worm G form a diflerential gear, and. operate in the manner usual in such mechanism. On the controlling shaft-C 1s a beveled pinion C indicated in dotted lines. in Figs.

1 and 2, in mesh with a similar pinion D on the short shaft D the arrangement being such as to permit the jaws D to clamp the motor brake-drum B and hold the motor shaft B when the switch, not shown, on the controlling shaft C is thrown, by turning the latter, to interrupt the current.

On an overhung end of the shaft C is the controlling lever E by which the shaft may be oscillated, and the boss E of the lever carries an upwardly presented beveledfaced lug or spur E On the opposite end of the controlling shaft C, within the arm A, is a cam C for controlling the hoisting brake-drum F 5 by means to be described.

The projecting end of the shaft F carries a small beveled gear-wheel F in mesh with a beveled pinion J31 on a screweshaft J mounted in lugs A on the arm A and carrying a movable nut J arranged to travel rearwardly when the shaft F is turned as l v in hoisting and forwardly during the lowering operation, and'tost'rike the spur E of the controlling lever E at the limit of the hoisting movement and thus automatically swing the lever and oscillate the shaft C in the direction to cut off the current and apply the jawsD to the motor brake-drum B A The nut J can be located or adjusted to strike the spur E at any predetermined heightof hoist, as governed by the number of turns of the hoisting-shaft F.

Encircling the hoisting brake-drum F is abrake-band Lf attached to a brake-lever L extending rearwardly beneath the brakecam C on the controlling shaft C. The brake-lever L is raised-by a contractile spring L indicated in dotted ,lines in Figs. 1 and 2, to tighten the brake-band and hold the brake drum F 5 frictionally, and is forced downwardly to release the brake drum by the action of thecam G The latter is rounded at the'lower front face concentrically to the shaft C so that the rearward movementof the controlling lever E is' of 'no cf:

fect on the brake-lever L, but the forward movement of the lever E, toward the load,

depresses the brake-lever and releases the hoisting brake-drum F By manipulating the lever E the operator can control the speed of descent in lowering and stop at any point in such travel.

The operation of the hoisting mechanism is as follows :AssuIning the parts to be in the positions indicated by the full lines in Fig. 1, with the controlling lever E thrown to the rear, the motor brake-drum is released, the motor is operating and the worm B is turning the wormwheel G. The hoisting brake-drum F is held stationary and consequently the beveled gear-wheel F is stationary, resulting in the rotation of the shaft F and hoisting drum F in the direction to wind the cable M upon the drum and hoist the load. As the hoisting movement continues the nut J travels rearwardly until the limit of the upward movement of the load is reached, at this point the nut J engages the spur E on the controlling lever E and forces the latter to the middle position, while still in the grasp of the operator, in which position the current is cut off and the motor brake-drum held, and as in this position the. hoisting brake-drum F is still thus turned to depress the brake-lever L and release the hoisting brake-drum ,F.

Thus conditioned the worm B holds the .wo rm-wheel G stationary, but the gravity of-the .load turns the hoisting drum in the direction to unwmd the cable, and causes the shaft F to rotate with its beveled earwheel F the motion being permitte by 'thetransference of movement through the pinions H to the beveled gear-wheel F and the brake-drum .F fixed thereto. The speed of the lowering operation is. varied by manipulating) the lever E to induce more or less friction etween the brake bandL and lowering operation the current is out o and ,drum F n.It will be noted that durin the i thus effecting a saving of electric energy and also permitting the cable to unwind at any desiredspeed, thus effecting a corre-- sponding saving. of time in lowering the ceeding load to be lifted.

I. claim .I

1. In a hoisting mechanism, a motor, a motor drive-shaft, a hoisting-shaft, a brake on said hoisting-shaft, differential gearing between, said hoisting-shaft and brake, operated by said motor drive-shaft, and controlling means adapted in-one position to apply said brake'and to actuate said motor to hoist a load, and in another position to stop said motor and release said brake to allow a road to lower by gravity.

J2. In a hoisting-mechanism, a motor, a

motor drive-shaft, a hoisting-shaft, a brake on said hoisting-shaft,difi'erential gearing between said hoisting-shaft and brake, operated bysaid motor drive-shaft, controlling means adapted in one position-to apply said hoisting-shaft brake and to actuate said motor to hoist a load; andin another position i to stop saidmotor and release said brake to allow a load to lower by gravity, and means for automatically changing said controlling means from the hoisting to the lowering po= sition, ata predetermined point in the hoisting movement.

3. In a hoisting mechanism, a motor, a

motordrive-sha-ft, a brake on the latter, a

hoisting-shaft, a sleeve on said hoistingshaft, a brake on said sleeve, differential gearing between said hoisting-shaft and sleeve, operated by said motor drive-shaft, and controlling means adapted in one position to release said motordrive-shaft brake and to actuate said motor to hoist a load,

and in another position to stop-said motor, apply said motor drive-shaft brake, and release said hoi'sting-shaft brake to allow a load to lower by gravity, said controlling 90 load or m engaging the cable .M with a suc- 4. In a hoisting mechanism, a motor, 'a

motor drive-shaft, a brake on the latter, a

hoisting-shaft, a sleeve. on said hoisting-- shaft, a brake on said sleeve, 'difierential gearing between said hoisting-shaft and sleeve, operated by said motor-drive-shaft, and controlling means adapted. in'one position to release said motordriVe-Shaft'brake and to actuate said motor to hoist a load, and in another position to stop said motor, apply saidmotor drive-shaft brake, and release said hoisting-shaft brake to allow a load,to lower by gravity, said controlling means arranged to .control said hoistings'haft brake and permit the speed of such lowering operation to be varied, and means for automatically changing said controlling means from the hoisting to the lower position at a predetermined point in the hoisting movement.

k 5, In a hoisting mechanism, a motor, a* motor drive-shaft, a worm on said shaft, an

annular worm-wheel in mesh with said worm, a hoisting-shaft, a spider-frame on the latter having its arms engaged in said worm-wheel, beveled pinions, onsaid arms, a' sleeveon said hoisting-shaft, a beveled gear-wheel fixedon said hoisting-shaft and in mesh with said pinions, a beveled gear- 1 wheel fixed on said sleeve'and in mesh with said pinions, a hoisting drum on said hoisting-shaft, a brake drum on said sleeve, and

means for holding said worm and said brake drum against rotation.

6. In a hoisting mechanism, a motor, a

motor drive-shaft, aworm onsaid shaft,

, on said brake drum, a spring actuated brakelever arranged to actuate said band and hold said brake drum, and a controlling shaft fabove set forth I having-a cam for moving said brake-lever in opposition to its spring and relaxing said band. i a

i 7. In a hoisting mechanism, a motor, a

motor drive-shaft, a brake thereon and" aworm on said shaft, a hoisting-shaft, a worm-wheel in mesh with said Worm, a spider-frame loosely mounted on said hoisting-shaft and having its arms engaged in saidworm-wheel, beveled pinions on said arms, a sleeve loosely inclosin said, hoisting-shaft, a beveled gear-wheel fi xed on said hoisting-shaft and in meshwith said pinions, a beveled gear-wheel fixed on said sleeve and in mesh with said pinion's, a hoisting drum on said hoisting-shaft, a brake drum on said sleeve, a brake-band on said brake drum, a-spring actuated lever arranged'to actuate said band and hold said brake drum, a controlling shaft having a cam for moving said brake-lever in opposition to its spring and relaxing said band,

and means actuated by said controlling shaft for applying said drive-shaft brake.

8. In a hoisting mechanism, a motor, a-.

motor'drive-shaft, 'a brake and a worm on said shaft, a hoisting-shaft, a worm-wheel in mesh with said worm, a spider-frame loosely mounted on said hoisting-shaft and having' its arms engaged in said wormwheel, beveled p1n1ons on said arms, a sleeve -lobsely inclosing said hoisting-shaft, a beveled gear-wheel fixed on said hoisting-shaft and in mesh with said pinions, a beveled gear-wheelfixed on said sleeve and in mesh with said pinions, a hoisting drum on said hoisting-shaft, a brake drum on said sleeve,

a brake-band on said brake drum, aispring actuated brake-lever arrange d to actuate said band and hold said brake drum, a controlling shaft havmg'a cam for moving said brake-lever in opposltion to its spring and relaxing said. band, means actuated by said controlling shaft for applying said driveshaft brake, a controlling lever on said controlling shaft, a spur on, said lever, a screwshaft rotated by said hoisting-shaft, and a traveling nut on said screw-shaft, arranged to strike said spur and move said controllin -le ver and controlling-shaft.

I h testimony that I claim the invention aflix my signature. JOSEPH. H. DONAT. y 

